The word reservation usually means booking something in advance—like a table at a restaurant, a seat on a flight, or a room at a hotel. For example, you might say, “Hi, I’d like to make a reservation for two at 7 p.m.” It simply lets the place know to expect you so they can hold a spot for you. People also use it in a different way to express hesitation, like “I have some reservations about this plan,” which means they’re not fully sure or comfortable with it. But in daily life, especially when traveling or dining out, it mostly just means saving your spot ahead of time.

“reservation” 這個字很常見，基本上有兩大核心用法：第一個是「預訂」、「預約」，比方說飯店、餐廳或機票都可以用；第二個則是「保留意見」或「疑慮」。如果你想說「我已經訂位了」，可以直接說 “I have a reservation for two at 7 p.m.”；而要表達「我對這個計劃有些保留」，就可以說 “I still have some reservations about the plan.” 另外，在美國歷史或地理語境中，reservation 也指「印第安保留地」，例如 “They visited a Native American reservation last summer.” 看到這個字時，就聯想到「事先保留好」的概念，無論是座位、懷疑，還是土地，這樣就能快速掌握它的多重意思了。

"Play it by ear" is a phrase people use when they want to handle a situation quickly, without a set plan. It means you decide how to act based on how things unfold, rather than following a strict schedule or preparation. For example, if you're unsure about what to do next, you might say, “Let's just play it by ear.” It's about being flexible and adapting to what comes up, rather than sticking to a plan.

當你說 "play it by ear"，可不是在說要即興彈鋼琴，而是指在沒有預先訂好計畫的情況下，見步行步、隨機應變的意思。想像朋友問你週末行程，你還不確定要做什麼，就可以回答："Let's just play it by ear and see what happens." 這個片語通常用在日常對話裡，表達我們會根據當下的情況再決定下一步，而不是一開始就把所有細節排得清清楚楚。下次如果同事邀你午餐，但你不確定開會會不會拖延，你也可以說："I'll have to play it by ear." 對方一聽就明白你需要等到臨場再決定。